Query Pagination Next: Add border and spacing support

[karthick-murugan]

What?

Add border and spacing block support to the Query Pagination Next ( Next Page ) block.

Part of #43247
Part of #43243

Why?

Query Pagination Next ( Next Page ) block is missing border and spacing support.

How?

Adds the border and spacing block support in block.json

Testing Instructions

• Go to Appearance > Editor > Styles > Edit Styles > Blocks.
• Ensure the Query Pagination Next (Next Page) block's border and spacing is configurable via Global Styles.
• Confirm Global Styles are applied correctly in both the editor and frontend.
• Edit a template or page and add a Query Loop block.
• Select a variation (e.g., Title & Date) and adjust pagination to display the "Next Link."
• Select the Next Page block and verify border, radius and spacing settings are available.
• Check that block styles take precedence over Global Styles.
• Ensure borders and spacing display correctly in both the editor and frontend.

Testing Instructions for Keyboard

None

Screenshots or screencast

In Backend:

In Frontend:

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[github-actions]

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